US20230123149A1 - Top cover assembly and battery - Google Patents
Top cover assembly and battery Download PDFInfo
- Publication number
- US20230123149A1 US20230123149A1 US17/956,245 US202217956245A US2023123149A1 US 20230123149 A1 US20230123149 A1 US 20230123149A1 US 202217956245 A US202217956245 A US 202217956245A US 2023123149 A1 US2023123149 A1 US 2023123149A1
- Authority
- US
- United States
- Prior art keywords
- reinforced
- explosion
- top cover
- body portion
- proof sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005336 cracking Methods 0.000 description 28
- 238000000034 method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 230000002028 premature Effects 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 238000004880 explosion Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000003712 anti-aging effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/143—Fireproof; Explosion-proof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
- H01M50/358—External gas exhaust passages located on the battery cover or case
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present disclosure relates to the field of batteries, and in particular, to a top cover assembly and a battery.
- the explosion-proof plate is set at the explosion-proof hole, so that when the pressure inside the battery exceeds the threshold value, the explosion-proof plate can be automatically damaged by excessive pressure, so that the inside of the battery is connected to the outside through the explosion-proof hole, thus releasing the high temperature and high pressure gas inside the battery, thus avoiding the explosion of the battery and ensuring the safety of the use of the battery.
- the embodiments of the present disclosure disclose a top cover assembly and a battery, which can effectively mitigate the deformation effect of the explosion-proof sheet under different pressure effects, and reduce the aging probability of the explosion-proof sheet.
- a top cover assembly comprising:
- an explosion-proof sheet wherein the explosion-proof sheet is configured to be connected to the top cover plate to close the explosion-proof hole, and the explosion-proof sheet comprises:
- connecting portion configured to be connected to the top cover plate
- the body portion being connected to the connecting portion and being configured to be disposed in the explosion-proof hole to close the explosion-proof hole, the body portion being provided with at least one reinforced portion;
- the weak portion being located between the body portion and the connecting portion;
- a thickness of the reinforced portion is h1
- a thickness of the body portion is h2, and 1 ⁇ (h1+h2)/h2 ⁇ 2.8.
- At least one outer surface of the reinforced portion is an inclined surface or an arc surface, such that the reinforced portion has a width gradually increasing from a top portion of the reinforced portion toward the body portion, a width of a side of the reinforced portion connected to the body portion is d, and d ⁇ 0.7 mm.
- a projection area of the body portion is S1
- a projection area of the reinforced portion is S2, and 5 ⁇ S1/S2 ⁇ 10.
- the reinforced portion is a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories.
- the reinforced portion is a C-shaped convex ridge
- the body portion when the body portion is provided with a plurality of the reinforced portions, at least two reinforced portions are symmetrically arranged relative to a center of the body portion, and when at least two adjacent reinforced portions are connected, the two adjacent reinforced portions are connected at their middle to form a middle connecting portion, and the middle connecting portion is located in the middle of the body portion;
- a projection area of the body portion is 51, a projection area of the middle connecting portion is S3, and 80 ⁇ S1/S3 ⁇ 600.
- the reinforced portion In the extending direction of the reinforced portion, the reinforced portion has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
- the reinforced portion in the extending direction of the reinforced portion, has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
- the weak portion comprises a first portion and a second portion connected to each other, along the thickness direction of the explosion-proof sheet, a minimum thickness of the first portion is h3, a minimum thickness of the second portion is h4, and h2>h3>h4;
- At least one end portion of the reinforced portion extends to be connected to a connection of the first portion and the second portion, or at least one end portion of the reinforced portion extends to be connected to the first portion.
- the weak portion is a racetrack-shaped structure
- the racetrack-shaped structure comprises two straight line segments and two arc-shaped segments, the two straight line segments are parallel to each other, and the two arc-shaped segments are respectively connected to both ends of the two straight line segments;
- the straight line segments are formed as the first portion, and the arc-shaped segments are formed as the second portion.
- the present disclosure discloses a battery, comprising a housing and a top cover assembly according to the first aspect, wherein the housing is provided with an accommodating cavity having an opening, and the top cover assembly is connected to the housing to cover the opening of the accommodating cavity.
- an explosion-proof hole is formed in the top cover plate, and the explosion-proof sheet is connected to the top cover plate to close the explosion-proof hole.
- the explosion-proof sheet includes a weak portion connected between the connecting portion and the body portion, so that when the pressure on the explosion-proof sheet is too large (that is, when the air pressure in the accommodating cavity of the housing exceeds a threshold value), the weak portion can generate cracking so that the high-temperature, high-pressure gas inside the housing can be discharged in a timely manner, and the cracking process of the explosion-proof sheet is controllable, and the intensity of the cracking process of the explosion-proof sheet is reduced, so as to reduce the impact generated when the explosion-proof sheet is damaged.
- the structural strength of the body portion can be improved to reduce the overall deformation of the body portion and the reinforced portion when the explosion-proof sheet is subjected to an external force, thereby reducing the overall deformation of the explosion-proof sheet, so that the weak portion is not prone to aging, thereby preventing the weak portion from premature cracking when the pressure borne by the weak portion does not reach the threshold value, thereby prolonging the service life of the battery.
- the overall thickness of the body portion and the reinforced portion is not too thick, so that the structural strength of the explosion-proof sheet is not too strong, thus ensuring a high cracking precision of the explosion-proof sheet, that is, ensuring that the explosion-proof sheet can crack when the pressure borne by the explosion-proof sheet reaches a threshold range, and the explosion-proof sheet has a good effect of improving the safety of the battery.
- FIG. 1 is a schematic structural view of a top cover assembly according to a first aspect of the present disclosure
- FIG. 2 is a schematic structural exploded view of a top cover assembly according to a first aspect of the present disclosure
- FIG. 3 is a partial cross-sectional view of a top cover assembly according to the first aspect of the present disclosure
- FIG. 4 is another partial cross-sectional view of the top cover assembly according to the first aspect of the present disclosure.
- FIG. 5 is a schematic structural view of an explosion-proof sheet according to the first aspect of the present disclosure.
- FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5 ;
- FIG. 7 is a cross-sectional view taken along line B-B in FIG. 5 ;
- FIG. 8 is another three schematic structural views of an explosion-proof sheet according to the first aspect of the present disclosure.
- FIG. 9 is a partial cross-sectional view of an explosion-proof sheet according to the first aspect of the present disclosure.
- FIG. 10 is a schematic structural view of a battery according to a second aspect of the present disclosure.
- FIG. 11 is a schematic structural exploded view of a battery according to the second aspect of the present disclosure.
- top cap assembly 10
- top cover plate 10
- explosion-proof hole 100 a, first step surface; 100 b , second step surface; 11
- explosion-proof sheet 110
- connecting portion 111 , body portion; 111 a , first surface; 111 b , second surface; 112 , weak portion; 112 a , first portion; 112 b , second portion; 113 , reinforced portion; 113 a , end portion; 113 b , first reinforced portion; 113 c , second reinforced portion; 113 d , third reinforced portion; 113 e , middle connecting portion; uhf, opening; 113 g , top portion; 12 , explosion-proof valve patch; 140 , straight line segment; 141 , arc-shaped segment; 2 , battery; 20 , housing; 200 , accommodating cavity; 201 , opening; 21 , battery cell.
- the terms “upper”, “lower”, “left”, “right”, “front”, “rear”, “top”, “bottom”, “inner”, “outer”, “middle”, “vertical”, “horizontal”, “transverse”, “longitudinal”, etc. indicate the orientation or position relationship based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the present disclosure and the embodiments thereof, and are not intended to limit the fact that the indicated device, element, or component must have a particular orientation, or be constructed and operated in a particular orientation.
- the terms “installed”, “arranged”, “provided”, “connected”, “joined” should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or may be an internal connection between two devices, elements, or components.
- installed arranged, “provided”, “connected”, “joined”
- it may be a fixed connection, a detachable connection, or an integral structure
- it may be a mechanical connection, or an electrical connection
- it may be directly connected, or indirectly connected through an intermediate medium, or may be an internal connection between two devices, elements, or components.
- the specific meanings of the above terms in the present disclosure may be understood on a case-by-case basis.
- first”, “second”, etc. are mainly used to distinguish different devices, elements or components (which may or may not be of the same specific types and configurations), and are not used to indicate or imply the relative importance and number of the indicated devices, elements, or components. Unless otherwise stated, “a plurality of” means two or more.
- an explosion-proof hole is generally formed in the top cover plate of the battery, and an explosion-proof sheet is arranged at the explosion-proof hole.
- the explosion-proof sheet can automatically generate damage under excessive pressure when the pressure inside the battery reaches a threshold value, so that the inside and the outside of the battery are communicated through the explosion-proof hole and the crack of the explosion-proof sheet, so that high-temperature and high-pressure gas inside the battery is released, the internal and external pressure difference of the battery is balanced, so as to avoid the battery explosion and ensure the use safety of the battery.
- the cracking accuracy of the explosion-proof sheet is not high, resulting in premature cracking of the explosion-proof sheet when the air pressure inside the battery has not yet reached the threshold value, or cracking only when the air pressure inside the battery far exceeds the threshold value, resulting in poor safety of the use of the battery.
- the air pressure inside the battery changes along with the temperature of the environment where the battery is located, so that the explosion-proof sheet continuously deforms under the action of different pressures, so that the structure of the explosion-proof sheet is prone to aging and fragile due to multiple times of deformation.
- the explosion-proof sheet cannot withstand the pressure and break, thus affecting the normal service life of the battery.
- the present disclosure discloses a top cover assembly, the top cover assembly comprising: a top cover plate and an explosion-proof sheet.
- An explosion-proof hole is formed in the top cover plate, the explosion-proof sheet is configured for being connected to the top cover plate to close the explosion-proof hole.
- the explosion-proof sheet comprises a connecting portion, a body portion, a weak portion and a reinforced portion.
- the connecting portion is configured for being connected to the top cover plate, the body portion is connected with the connecting portion and configured for closing the explosion-proof hole, the weak portion is located between the body portion and the connecting portion, and the reinforced portion is convexly arranged on the body portion.
- the weak portion breaks, so that the body portion is at least partially separated from the connecting portion, so that a gap is generated between the body portion and the connecting portion, so that the high-temperature high-pressure gas inside the battery discharges to the outside of the battery.
- the deformation of the explosion-proof sheet under different pressure can be mitigated, that is, the deformation of the weak portion caused by the floating of the normal air pressure inside the battery during normal use of the battery can be reduced, and the aging probability of the weak portion is reduced, thereby avoiding the premature cracking of the weak portion when the internal pressure of the battery does not reach the threshold value, thereby improving the service life of the battery while ensuring the use safety of the battery.
- the thickness h1 of the reinforced portion and the thickness h2 of the body portion satisfy: 1 ⁇ (h1+h2)/h2 ⁇ 2.8, which enables the body portion to be deformed when the pressure borne by the body portion reaches the threshold to make the weak portion crack, the structure of the explosion-proof sheet is reasonable, the cracking accuracy is high, and the explosion-proof sheet is effective in improving the safety of the battery, where the cracking accuracy refers to the degree of proximity of the actual pressure to the pressure threshold when the cracking of the explosion-proof sheet occurs.
- FIG. 1 is a schematic structural view of a top cover assembly according to a first aspect of the present disclosure
- FIG. 2 is a schematic structural exploded view of a top cover assembly according to a first aspect of the present disclosure
- FIG. 3 is a partial cross-sectional view of a top cover assembly according to the first aspect of the present disclosure.
- the first aspect of the embodiments of the present disclosure discloses a top cover assembly 1 that can be applied to a battery, which can include a housing and an battery cell provided in the housing, and the top cover assembly 1 is connected to the housing to cover the opening of the housing.
- the top cover assembly 1 includes a top cover plate 10 and an explosion-proof sheet 11 .
- the top cover plate 10 is provided with an explosion-proof hole 100 penetrating through the top cover plate 10 along its own thickness direction.
- the explosion-proof sheet 11 is configured for being connected to the top cover plate 10 to close the explosion-proof hole 100 .
- the explosion-proof plate 11 comprises a connecting portion 110 , a body portion 111 and a weak portion 112 .
- the connecting portion 110 is configured for being connected to the top cover plate 10 .
- the body portion 111 is connected to the connecting portion 110 and is configured for being disposed in the explosion-proof hole 100 to close the explosion-proof hole 100 .
- the body portion 111 is provided with a reinforced portion 113 .
- the weak portion 112 is located between the body portion 111 and the connecting portion 110 .
- the thickness of the reinforced portion 113 is h1
- the thickness of the body portion 111 is h2, and 1 ⁇ (h1+h2)/h2 ⁇ 2.8.
- the explosion-proof sheet 11 includes a weak portion 112 connected between the connecting portion 110 and the body portion 111 , such that when the pressure borne by the explosion-proof sheet 11 is too large (i.e., when the air pressure in the housing exceeds a threshold value), the weak portion 112 can generate cracking, so that the process of cracking the explosion-proof sheet 11 is controllable while the high-temperature high-pressure gas in the housing of the battery is timely discharged, thereby reducing the intensity of the cracking process of the explosion-proof sheet 11 , and reducing the impact of the explosion-proof sheet 11 during breakage.
- the structural strength of the body portion 111 can be improved, so that the overall deformation of the body portion 111 and the reinforced portion 113 is reduced when the explosion-proof sheet 11 is subjected to external force, thereby effectively relieving the deformation effect of the explosion-proof sheet 11 under different pressure effects, and reducing the aging probability of the explosion-proof sheet 11 , thereby preventing the weak portion 112 from premature cracking when the pressure borne by the weak portion 112 does not reach the threshold value, thereby prolonging the service life of the battery.
- the thickness h1 of the reinforced portion 113 and the thickness h2 of the body portion 111 satisfy: 1 ⁇ (h1+h2)/h2 ⁇ 2.8, for example, (h1+h2)/h2 is 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 or 2.8.
- the reinforced portion 113 can locally thicken the body portion 111 to improve the overall structural strength of the body portion 111 .
- the side of the top cover assembly 1 for facing the inside of the battery i.e., the side facing the inside of the housing of the battery
- the side of the top cover assembly 1 for facing the outside of the battery i.e., the side away from the inside of the housing
- the outer side as shown in FIG. 3 , with the arrows in FIG. 3 illustrating the inner side direction as well as the outer side direction.
- the top cover assembly 1 further comprises an explosion-proof valve patch 12 , the explosion-proof valve patch 12 is configured for being connected to the top cover plate 10 and covering the explosion-proof hole 100 , along the thickness direction of the explosion-proof sheet 11 , the explosion-proof valve patch 12 is located on the upper side of the explosion-proof sheet 11 and is spaced apart from the explosion-proof sheet 11 .
- the explosion-proof valve patch 12 and the explosion-proof sheet 11 are arranged at intervals, a deformation space can be provided for the explosion-proof sheet 11 , so that the explosion-proof sheet 11 is deformed to crack at the weak portion 112 .
- the thickness h1 of the reinforced portion 113 and the thickness h2 of the body portion 111 satisfy: 1 ⁇ (h1+h2)/h2 ⁇ 2.8, the overall thickness of the body portion 111 and the reinforced portion 113 is not too thick, so that sufficient space exists between the explosion-proof sheet 11 and the explosion-proof valve patch 12 , so that the overall thickness of the top cover assembly 1 can be made smaller while the explosion-proof sheet 11 is deformed, so as to achieve the thin design of the top cover assembly 1 .
- the explosion-proof valve patch 12 described in the foregoing is located on the upper side of the explosion-proof sheet 11 , which means that the explosion-proof valve patch 12 is located on a side of the explosion-proof sheet 11 facing the outside of the battery, so that the explosion-proof valve patch 12 can protect the explosion-proof sheet 11 from one side of the explosion-proof sheet 11 facing the outside of the battery, thereby avoiding the explosion of the explosion-proof sheet 11 due to accidental impact on the surface of the battery during the use of the battery, which would otherwise affect the use safety of the battery.
- the explosion-proof hole 100 may be a step hole, the hole wall of the explosion-proof hole 100 may form a first step surface 100 a , and the connecting portion 110 of the explosion-proof sheet 11 is connected to the first step surface 100 a , so that the connecting position of the explosion-proof plate 11 relative to the explosion-proof hole 100 can be limited and guided by the first step surface 100 a , so that the explosion-proof sheet 11 can be easily connected to a specific position of the explosion-proof hole 100 (i.e., the first step surface 100 a ).
- the hole wall of the explosion-proof hole 100 may further form a second step surface 100 b spaced apart from the first step surface 100 a , the second step surface 100 b is located on the upper side of the first step surface 100 a , and the explosion-proof valve patch 12 is connected to the second step surface 100 b .
- the connecting position of the explosion-proof valve patch 12 relative to the explosion-proof hole 100 can be limited and guided through the second step surface 100 b , so that the mounting process of the explosion-proof valve patch 12 is simpler and more convenient.
- the relative position of the explosion-proof sheet 11 relative to the explosion-proof valve patch 12 can be limited by the first step surface 100 a and the second step surface 100 b , so that the explosion-proof sheet 11 is spaced from the explosion-proof valve patch 12 . In this way, sufficient space is formed between the explosion-proof sheet 11 and the explosion-proof valve patch 12 for deformation of the explosion-proof sheet 11 .
- FIG. 5 is a schematic structural view of an explosion-proof sheet 11 according to a first aspect of the present disclosure
- the connecting portion 110 may be formed as an annular sheet structure, and the connecting portion 110 may be annularly disposed on the periphery of the body portion 111 .
- the connecting portion 110 may be fixedly connected to the first step surface 100 a and the side wall of the explosion-proof hole 100 in a welding manner, so that the connection between the connection part 110 and the explosion-proof hole 100 has high strength and good sealing performance.
- the weak portion 112 of the explosion-proof sheet 11 can generate cracking to discharge the high-temperature high-pressure gas inside the battery. It will be appreciated that, when the explosion-proof sheet 11 is subjected to a large external force, the weak portion 112 may first be destroyed, thereby ensuring that the cracking position of the explosion-proof sheet 11 is the weak portion 112 , so that the cracking process of the explosion-proof sheet 11 is controllable, and the use safety of the explosion-proof sheet 11 is high. Therefore, the structural strength of the weak portion 112 should be less than the structural strength of the body portion 111 and the connecting portion 110 .
- the thickness of the weak portion 112 may be smaller than the thickness of the body portion 111 and the connecting portion 110 , so that the structural strength of the weak portion 112 is less than the structural strength of the body portion 111 and the connecting portion 110 , so that when the explosion-proof sheet 11 is subjected to a large external force, the weak portion 112 can first be damaged to generate a crack.
- the weak portion 112 may include a first portion 112 a and a second portion 112 b connected to each other, along a thickness direction of the explosion-proof sheet 11 (i.e., in the inner and outer directions), a minimum thickness of the first portion 112 a is h3, a minimum thickness of the second portion 112 b is h4, a thickness h2 of the body portion 111 , a minimum thickness h3 of the first portion 112 a , and a minimum thickness h4 of the second portion 112 b may satisfy: h2>h3>h4 such that the structural strength of the second portion 112 b is less than the structural strength of the first portion 112 a , and the structural strength of the first portion 112 a is less than the structural strength of the body portion 111 , so that the second portion 112 b is more likely to crack immediately when the pressure is greater than the threshold value, so as to further improve the cracking accuracy of the explosion-
- FIG. 6 and FIG. 7 show the connections of the weak portion 112 with the body portion 111 and the connecting portion 110 respectively by dotted lines. It will be understood that the dotted lines are intended only as an indication of the position of the connections and do not constitute a limitation on the physical structure.
- the second portion 112 b can be cracked when the pressure inside the battery exceeds the threshold.
- the first portion 112 a can act as a secondary cracking mechanism, that is, the first portion 112 a can also be cracked to make the connection area between the body portion 111 and the connecting portion 110 smaller, or to make the body portion 111 separate from the connecting portion 110 as a whole. Therefore, the crack area for gas leakage is larger, and the gas leakage efficiency is higher, so that the inside and outside of the battery can reach a safe state of air pressure balance more quickly.
- the second portion 112 b there may be a plurality of first portions 112 a and second portions 112 b , the plurality of second portions 112 b are spaced apart, the plurality of first portions 112 a are respectively connected between the plurality of second portions 112 b , the thickness of each of the first portions 112 a may be equal, and the structural strength of each of first portions 112 a may be equal, so that the overall force borne by the explosion-proof sheet 11 is more uniform, or the thickness of at least one first portion 112 a is less than the thickness of the other first portions 112 a , so that the structural strength of the at least one first portion 112 a is less than the structural strength of the other first portions 112 a , so that when the pressure inside the battery rises rapidly and the pressure borne by the explosion-proof sheet 11 is instantaneously far above a threshold, the first portions 112 a can also follow the second portions 112 b to start to crack from a first portion 112 a with the
- the weak portion 112 may be a racetrack-shaped structure
- the racetrack-shaped structure may include two straight-line segments 140 and two arc-shaped segments 141 , the two straight-line segments 140 are parallel to each other, and the two arc-shaped segments 141 are connected to both ends of the two straight-line segments 140 respectively, so that the two straight-line segments 140 have no shape change along the extension direction, and it is difficult to generate stress concentration, while the shape of the arc-shaped segments 141 along the extension direction changes gently, and the stress concentration can be greatly mitigated.
- the straight line segments 140 may be formed as the first portion 112 a
- the arc-shaped segments 141 may be formed as the second portion 112 b , so that when the explosion-proof sheet 1 is subjected to pressure, it is difficult to generate stress concentration at the first portion 112 a , and the stress concentration at the second portion 112 b can be greatly mitigated, which can reduce the situation that the second portion 112 b is cracked prematurely due to excessive local stress caused by stress concentration before the pressure borne by the explosion-proof sheet 11 reaches the threshold value, which would otherwise affects the safety of the battery.
- the reinforced portion 113 is configured to enhance the strength of the body portion 111 to reduce the overall deformation generated by the reinforced portion 113 and the body portion 111 when the explosion-proof sheet 11 is subjected to pressure, thereby reducing the deformation generated by the explosion-proof sheet 11 at the position of the body portion 111 .
- the body portion 111 may include a first surface 111 a and a second surface 111 b opposite to each other along the thickness direction of the body portion 111 itself (i.e., along the inner and outer directions), and the first surface 111 a and/or the second surface 111 b are provided with the reinforced portion 113 , that is, the reinforced portion 113 may be provided on the first surface 111 a , or may be provided on the second surface 111 b , or both the first surface 111 a and the second surface 111 b may be provided with the reinforced portion 113 . It will be appreciated that as long as the body portion 111 can make the overall structural strength of the body portion 111 and the reinforced portion 113 meet the requirements of use, the present embodiment does not specifically limit the position of the reinforced portion 113 on the body portion 111 .
- the reinforced portion 113 is provided on the first surface 111 a as an example for description.
- the overall thickness (i.e., h1+h2) of the reinforced portion 113 and the body portion 111 may satisfy: 0.3 mm ⁇ (h1+h2) ⁇ 1.7 mm, for example, the overall thickness (h1+h2) of the reinforced portion 113 and the body portion 111 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, or 1.7 mm, etc., so that the overall structural strength of the reinforced portion 113 and the body portion 111 can satisfy that the overall deformation of the reinforced portion 113 and the body portion 111 is relatively small when the pressure borne by the explosion-proof sheet 11 does not exceed the threshold.
- the structural strength of the reinforced portion 113 and the body portion 111 varies depending on the material of the explosion-proof sheet 11 when the overall thickness of the reinforced portion 113 and the body portion 111 remains the same.
- the explosion-proof sheet 11 as a whole may be made of metal, for example, the explosion-proof sheet 11 may be a thin sheet of aluminum.
- the projection area of the body portion 111 is S1
- the projection area of the reinforced portion 113 is S2.
- the overall structural strength of the body portion 111 should not be too large, so that the projection area S1 of the reinforced portion 113 on the body portion 111 should not be too large.
- the area S1 and the area S2 may satisfy: 5 ⁇ S1/S2 ⁇ 10, for example, S1/S2 may be 5.0, 5.3, 5.5, 5.7, 6.0, 6.3, 6.5, 6.7, 7.0, 7.3, 7.5, 7.7, 8.0, 8.3, 8.5, 8.7, 9.0, 9.3, 9.5, 9.7, or 10.0, etc.
- the projection of the body portion 111 along the inner and outer directions refers to the projection of the body portion 111 along the inner and outer directions on a plane perpendicular to the inner and outer directions
- the projection of the reinforced portion 113 along the inner and outer directions refers to the projection of the reinforced portion 113 along the inner and outer directions on a plane perpendicular to the inner and outer directions.
- the reinforced portion 113 may be a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories.
- the reinforced portion 113 may extend along multiple arc-shaped segments to form a wavy convex ridge.
- the reinforced portion 113 may be an arc-shaped convex ridge.
- the structural strength needs to be improved for the middle portion of the body portion 111 .
- the reinforced portion 113 can extend from the middle portion of the body portion 111 to the two sides of the body portion 111 , so that the reinforced portion 113 can effectively improve the structural strength of the middle region of the body portion 111 .
- the reinforced portion 113 extends from the middle portion of the body portion 111 to both sides of the body portion 111 , the reinforced portion 113 can be used to disperse the force on the middle portion of the body portion 111 to both sides of the body portion 111 , so that the overall force on the body portion 111 is even, and the deformation resistance of the body portion 111 is better.
- the reinforced portion 113 has two end portions 113 a , and the two end portions 113 a may extend toward the weak portion 112 , in other words, the end portions 113 a of the reinforced portion 113 may extend to be close to the weak portion 112 , or may extend to be connected to the weak portion 112 , so that the structure of the portion of the body portion 111 adjacent to the weak portion 112 is also reinforced, so as to reduce the deformation of the portion adjacent to the weak portion 112 when the body portion 111 is subjected to external force, thereby reducing the deformation generated by the weak portion 112 to a greater extent during normal use of the battery, and further improving the anti-aging effect of the weak portion 112 .
- the body portion 111 deforms in a plurality of different directions, and since the reinforced portion 113 of the arc-shaped segment or the wavy segment may extend in a plurality of different directions, the deformation of the body portion 111 may be adapted in a plurality of different directions, thereby improving the impact resistance of the body portion 111 .
- At least one end portion 113 a of the reinforced portion 113 may extend to be connected to the weak portion 112 , so that when the explosion-proof sheet 11 is subjected to an external force, the deformation generated by the weak portion 112 near the periphery of the end portion 113 a is minimal, and the anti-aging effect achieved by the reinforced portion 113 on the weak portion 112 at the position is best.
- the weak portion 112 may include a first portion 112 a and a second portion 112 b connected to each other, and the weak portion 112 may be a racetrack-shaped structure, the racetrack-shaped structure may include two straight line segments 140 and two arc-shaped segments 141 , the two straight line segments 140 are formed as two first portions 112 a .
- At least one end portion 113 a of the reinforced portion 113 may extend to be connected to the connection between the first portion 112 a and the second portion 112 b , or, at least one end portion 113 a of the reinforced portion 113 may extend to be connected to the first portion 112 a , so that the reinforcing effect of the reinforced portion 113 on the structural strength of the body portion 111 can extend to the connection between the body portion 111 and the first portion 112 a , so as to further increase the structural strength gap between the first portion 112 a and the second portion 112 b , so that the second portion 112 b is easier to quickly and timely generate cracking when the pressure borne by the explosion-proof sheet 11 exceeds a threshold value.
- the two end portions 113 a of the reinforced portion 113 respectively extend to the two connections of the first portion 112 a and the second portion 112 b and are connected to the first portion 112 b.
- the reinforced portions 113 there may be one or more reinforced portions 113 , as long as the reinforced portions 113 can be used to reinforce the overall structural strength of the body portion 111 , so that the overall structural strength of the body portion 111 meets the design and use requirements, and the number of the reinforced portions 113 is not specifically limited in the present embodiment.
- the number of the reinforced portions 113 is not specifically limited in the present embodiment.
- there may be a plurality of reinforced portions 113 so that the structural strength enhancement effect of the reinforced portions 113 on the body portion 111 can be improved by increasing the number of the reinforced portions 113 .
- the reinforced portion 113 may be a convex ridge extending along an arc-shaped, wavy, zigzag, or straight line trajectories, and when there is a plurality of the reinforced portions, it will be appreciated that the shape of each reinforced portion 113 may be the same (as shown in FIG. 5 and in (B) of FIG. 8 , as shown in FIG. 5 and in (B) of FIG.
- each reinforced portion 113 may have a different shape
- some of the plurality of reinforced portions 113 may have the same shape and another part of the reinforced portions 113 may have different shapes (as shown in (C) of FIG. 5 , which illustrates three reinforced portions 113 , two of which are convex ridges extending along an arc-shaped trajectory and the remaining one of which is a convex ridge along a straight line trajectory), as long as the reinforced portions 113 can make the overall structural strength of the body portion 111 and the reinforced portions 113 meet the use requirements, and the extension shape of each reinforced portion 113 is not specifically limited in this embodiment.
- At least two reinforced portions 113 are symmetrically arranged relative to the center of the body portion 111 , so that the structural strength reinforcing effect of the reinforced portions 113 on the body portion 111 is more balanced, so that the force on the body portion 111 is more even, and the use stability of the body portion 111 is high.
- At least two adjacent reinforced portions 113 may be connected, and/or at least two adjacent reinforced portions 113 may be arranged at intervals, in other words, in the plurality of reinforced portions 113 , two adjacent reinforced portions 113 are connected to each other, or the plurality of reinforced portions 113 are spaced apart from each other, or there are two adjacent reinforced portions 113 that are connected while two adjacent reinforced portions 113 are provided at intervals.
- the reinforced portion 113 is two, and the two reinforced portions 113 are connected to each other.
- there are two reinforced portions 113 there are two reinforced portions 113 , and the two reinforced portions 113 are spaced apart.
- C of FIG.
- the three reinforced portions 113 there are three reinforced portions 113 , and the three reinforced portions 113 are defined as the first reinforced portion 113 b , the second reinforced portion 113 c and the third reinforced portion 113 d , the first reinforced portion 113 b is connected to the second reinforced portion 113 c and the third reinforced portion 113 d , respectively, and the second reinforced portion 113 c is spaced apart from the third reinforced portion 113 d.
- the two adjacent reinforced portions 113 can mutually reinforce the structural strength, thereby further improving the structural strength reinforcing effect of the reinforced portion 113 on the body portion 111 .
- At least two reinforced portions 113 are connected in the middle of the reinforced portions 113 themselves to form a middle connecting portion 113 e , and the middle connecting portion 113 e is located in the middle of the body portion 111 , so that the force borne by the middle portion of the body portion 111 can be dispersed to the multiple sides of the body portion 111 through the reinforced portion 113 , so that the force on the body portion 111 is more even, and the use stability of the body portion 111 is further improved. As shown in FIG.
- the two reinforced portions 113 are convex ridges extending along the arc-shaped trajectories, for example, taking a C-shaped ridge as an example, the openings 113 f of two C-shaped ridges are arranged opposite to each other, and are symmetrically arranged relative to the center of the body portion 111 , and the two C-shaped ridges can be connected at the middle of the body portion 111 to form a middle connecting portion 113 e .
- the middle connecting portion 113 e at least partially covers the middle position of the body portion 111 , so that the middle connecting portion 113 e can effectively reinforce the middle position of the body portion 111 , thereby effectively improving the deformation resistance of the body portion 111 in the middle position.
- the projection area of the body portion 111 is S1
- the projection area of the middle connecting portion 113 e is S3
- the area of the middle connecting portion 113 e should meet the requirement for structural strength reinforcement required for the middle position of the body portion 111 , but also meet the requirement that the body portion 111 can generate large deformation when the pressure borne by the body portion 111 exceeds a threshold value, so that the weak portion 112 can deform and crack.
- the area S2 and the area S3 may satisfy: 80 ⁇ S2/S3 ⁇ 600, for example, the area ratio S2/S3 may be 80, 90, 100, 110, 130, 150, 170, 200, 230, 250, 270, 300, 330, 350, 370, 400, 430, 450, 470, 500, 530, 550, 570, or 600, etc.
- the projection of the body portion 111 along the inner and outer directions refers to the projection of the body portion 111 along the inner and outer directions on a plane perpendicular to the inner and outer directions
- the projection of the middle connecting portion 113 e along the inner and outer directions refers to the projection of the middle connecting portion 113 e along the inner and outer directions on a plane perpendicular to the inner and outer directions.
- the “middle portion of the body portion 111 ” in the foregoing refers to a central point in the shape of the body portion 111 and a region near the center point.
- the present embodiment further defines a cross section of the reinforced portion 113 , so that the deformation resistance of the body portion 111 meets the requirements.
- FIG. 9 is a partial cross-sectional view of the explosion-proof sheet 11 according to the first aspect of the present disclosure.
- at least one outer surface of the reinforced portion 113 is an inclined surface (i.e., a cross-sectional shape of the reinforced portion 113 is trapezoidal) or an arc surface, so that the width (i.e., the width of the cross section) of the reinforced portion 113 gradually increases from the top portion 113 g of the reinforced portion 113 toward the body portion 111 .
- the reinforced portion 113 has the smallest volume.
- the width of the reinforced portion 113 is gradually increased from the top portion 113 g of the reinforced portion 113 toward the body portion 111 , so that the reinforced portion 113 can obtain greater structural strength with a smaller volume, thereby saving the material used for the reinforced portion 113 , so as to reduce the material cost of the explosion-proof sheet 11 , and at the same time reduce the space occupied by the reinforced portion 113 to increase the deformation space of the explosion-proof sheet 11 , so as to make the structure of the top cover assembly 1 more compact and reasonable.
- the connection between the body portion 111 and the reinforced portion 113 is shown by dotted lines in FIG. 9 . It will be appreciated that, the dashed-dotted line only serves as an indication of a position of the connection, and does not constitute a limitation on the physical structure.
- the reinforced portion 113 when the reinforced portion 113 is provided on the side surface of the body portion 111 facing the explosion-proof valve patch 12 , in the process that the body portion 111 is at least partially detached from the connecting portion 110 , the reinforced portion 113 may follow the body portion 111 to move in a direction towards the outside of the battery to strike the explosion-proof valve patch 12 .
- the top surface area of the reinforced portion 113 can be smaller, so that when the top portion 113 g of the reinforced portion 113 strikes the explosion-proof valve patch 12 , the contact area between the reinforced portion 113 and the explosion-proof valve patch 12 is relatively small, and the pressure applied to the explosion-proof valve patch 12 is relatively large, so that the explosion-proof valve patch 12 is prone to being damaged or easily separated from the top cover plate 10 . Therefore, the explosion-proof valve patch 12 no longer closes the explosion-proof hole 100 , and the high-temperature high-pressure gas inside the battery can be discharged to the outside of the battery through the explosion-proof hole 100 .
- an outer surface of the reinforced portion 113 is an inclined surface or an arc surface, as shown in (A) and (B) of FIG. 9
- (A) of FIG. 9 shows that the reinforced portion 113 has an outer surface as an inclined surface
- (B) of FIG. 9 shows that the reinforced portion 113 has an outer surface as an arc surface
- two surfaces of the reinforced portion 113 are inclined surfaces (as shown in (C) of FIG. 9 ) or both are arc surfaces, or one surface may be an inclined surface, and the other surface is an arc surface (as shown in (D) of FIG. 9 ).
- the reinforced portion 113 uses the least amount of material, and the least amount of material is cost to produce the explosion-proof sheet 11 .
- the width d of one side of the reinforced portion 113 connected to the body portion 111 can satisfy: d ⁇ 0.7 mm, for example, the width d of one side of the reinforced portion 113 connected to the body portion 111 may be 0.7 mm, 0.65 mm, 0.6 mm, 0.55 mm, 0.5 mm, 0.45 mm, 0.4 mm, 0.35 mm, 0.3 mm, 0.25 mm, 0.2 mm, 0.15, or 0.1 mm.
- FIG. 10 is a schematic structural view of a battery according to a second aspect of the present disclosure.
- FIG. 11 is a schematic structural exploded view of the battery according to the second aspect of the present disclosure.
- the second aspect of the embodiments of the present disclosure discloses a battery 2 , including the top cover assembly 1 described in the first aspect above.
- the battery 2 may be a secondary battery.
- the battery 2 further includes a housing 20 and a battery cell 21 .
- the housing 20 has an accommodating cavity 200 , and the accommodating cavity 200 forms the inside of the battery described above.
- the housing 20 has an opening 201 communicating with an external space.
- the top cover assembly 1 is fixedly connected to the housing 20 and closes the opening 201 , and the battery cell 21 is provided in the accommodating cavity 200 .
- the gas inside the battery 2 can break the explosion-proof sheet 1 and be released to the outside of the battery 2 , so that the internal and external air pressure of the battery 2 is balanced, and explosion of the battery 2 is avoided. Due to the strong anti-aging capability of the explosion-proof sheet 1 , the probability of premature cracking of the explosion-proof sheet 1 in the normal use process of the battery 2 is low, the service life of the battery 2 is longer, and the explosion-proof sheet 1 can generate cracking more quickly and timelier when the pressure borne by the explosion-proof sheet 1 exceeds the threshold value. Therefore, when the air pressure inside the battery 2 rises above the threshold value, the battery 2 can perform pressure relief more quickly and timelier, so as to balance the air pressure inside and outside the battery 2 , and the battery 2 has high safety in use.
- top cover assembly and the battery disclosed in the embodiments of the present disclosure are described in detail above. Specific examples are used herein to describe the principles and implementations of the present disclosure, and the descriptions of the above embodiments are merely used to help understand the top cover assembly and the battery of the present disclosure and the core idea thereof. Meanwhile, for a person of ordinary skill in the art, according to the idea of the present disclosure, there is a change in the specific implementation and application range. In summary, the content of the present specification should not be construed as a limitation of the present disclosure.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present disclosure discloses a top cover assembly and a battery. The top cover assembly comprises a top cover plate and an explosion-proof sheet. The explosion-proof sheet is configured for being connected to the top cover plate to close an explosion-proof hole formed in the top cover plate, and the explosion-proof sheet comprises: a connecting portion, a body portion, a weak portion and a reinforced portion, the connecting portion is configured for being connected to the top cover plate, the body portion is connected to the connecting portion and configured for closing the explosion-proof hole corresponding to the explosion-proof hole, the weak portion is located between the body portion and the connecting portion, the reinforced portion is convexly arranged on the body portion, along thickness direction of the explosion-proof sheet, the thickness of the reinforced portion is h1, the thickness of the body portion is h2, and 1<(h1+h2)/h2≤2.8.
Description
- The present disclosure relates to the field of batteries, and in particular, to a top cover assembly and a battery.
- At present, there are usually explosion-proof holes in the top cover of the battery, and the explosion-proof plate is set at the explosion-proof hole, so that when the pressure inside the battery exceeds the threshold value, the explosion-proof plate can be automatically damaged by excessive pressure, so that the inside of the battery is connected to the outside through the explosion-proof hole, thus releasing the high temperature and high pressure gas inside the battery, thus avoiding the explosion of the battery and ensuring the safety of the use of the battery.
- However, in the actual use process, there is often a problem that the cracking accuracy of the explosion-proof sheet is not high, resulting in premature cracking of the explosion-proof sheet when the air pressure inside the battery has not yet reached the threshold, affecting the safety of the battery, or cracking only when the air pressure inside the battery far exceeds the threshold, resulting in poor safety in the use of the battery. And, in the process of daily use, the air pressure inside the battery will change with the temperature of the environment in which the battery is located, the explosion-proof sheet is constantly deformed under the action of different pressures, so that the structure of the explosion-proof sheet is easily aged and fragile due to repeated deformations. As a result, before the air pressure inside the battery reaches the threshold value, the explosion-proof sheet cannot withstand the pressure and break, thus affecting the safety of the use of the battery and affecting the normal service life of the battery.
- The embodiments of the present disclosure disclose a top cover assembly and a battery, which can effectively mitigate the deformation effect of the explosion-proof sheet under different pressure effects, and reduce the aging probability of the explosion-proof sheet.
- To achieve the above objective, in a first aspect, the present disclosure discloses a top cover assembly, comprising:
- a top cover plate, wherein an explosion-proof hole is formed in the top cover plate; and
- an explosion-proof sheet, wherein the explosion-proof sheet is configured to be connected to the top cover plate to close the explosion-proof hole, and the explosion-proof sheet comprises:
- a connecting portion, wherein the connecting portion is configured to be connected to the top cover plate;
- a body portion, the body portion being connected to the connecting portion and being configured to be disposed in the explosion-proof hole to close the explosion-proof hole, the body portion being provided with at least one reinforced portion; and
- a weak portion, the weak portion being located between the body portion and the connecting portion;
- wherein along a thickness direction of the explosion-proof sheet, a thickness of the reinforced portion is h1, a thickness of the body portion is h2, and 1<(h1+h2)/h2≤2.8.
- In an optional embodiment, 0.3 mm≤(h1+h2)≤1.7 mm.
- In an optional embodiment, at least one outer surface of the reinforced portion is an inclined surface or an arc surface, such that the reinforced portion has a width gradually increasing from a top portion of the reinforced portion toward the body portion, a width of a side of the reinforced portion connected to the body portion is d, and d≤0.7 mm.
- In an optional embodiment, in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the reinforced portion is S2, and 5≤S1/S2≤10.
- In an optional embodiment, the reinforced portion is a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories.
- In an optional embodiment, the reinforced portion is a C-shaped convex ridge;
- when the body portion is provided with a plurality of the reinforced portions, at least two reinforced portions are symmetrically arranged relative to a center of the body portion, and when at least two adjacent reinforced portions are connected, the two adjacent reinforced portions are connected at their middle to form a middle connecting portion, and the middle connecting portion is located in the middle of the body portion;
- in the thickness direction of the explosion-proof sheet, a projection area of the body portion is 51, a projection area of the middle connecting portion is S3, and 80≤S1/S3≤600.
- In the extending direction of the reinforced portion, the reinforced portion has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
- In an optional embodiment, in the extending direction of the reinforced portion, the reinforced portion has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
- In an optional embodiment, the weak portion comprises a first portion and a second portion connected to each other, along the thickness direction of the explosion-proof sheet, a minimum thickness of the first portion is h3, a minimum thickness of the second portion is h4, and h2>h3>h4;
- at least one end portion of the reinforced portion extends to be connected to a connection of the first portion and the second portion, or at least one end portion of the reinforced portion extends to be connected to the first portion.
- In an optional embodiment, the weak portion is a racetrack-shaped structure, the racetrack-shaped structure comprises two straight line segments and two arc-shaped segments, the two straight line segments are parallel to each other, and the two arc-shaped segments are respectively connected to both ends of the two straight line segments;
- the straight line segments are formed as the first portion, and the arc-shaped segments are formed as the second portion.
- In a second aspect, the present disclosure discloses a battery, comprising a housing and a top cover assembly according to the first aspect, wherein the housing is provided with an accommodating cavity having an opening, and the top cover assembly is connected to the housing to cover the opening of the accommodating cavity.
- Compared with the prior art, the present disclosure has the following beneficial effects:
- According to the battery provided by the embodiments of the present disclosure, an explosion-proof hole is formed in the top cover plate, and the explosion-proof sheet is connected to the top cover plate to close the explosion-proof hole. The explosion-proof sheet includes a weak portion connected between the connecting portion and the body portion, so that when the pressure on the explosion-proof sheet is too large (that is, when the air pressure in the accommodating cavity of the housing exceeds a threshold value), the weak portion can generate cracking so that the high-temperature, high-pressure gas inside the housing can be discharged in a timely manner, and the cracking process of the explosion-proof sheet is controllable, and the intensity of the cracking process of the explosion-proof sheet is reduced, so as to reduce the impact generated when the explosion-proof sheet is damaged. At the same time, by arranging the reinforced portion at the body portion, the structural strength of the body portion can be improved to reduce the overall deformation of the body portion and the reinforced portion when the explosion-proof sheet is subjected to an external force, thereby reducing the overall deformation of the explosion-proof sheet, so that the weak portion is not prone to aging, thereby preventing the weak portion from premature cracking when the pressure borne by the weak portion does not reach the threshold value, thereby prolonging the service life of the battery.
- In addition, the thickness h1 of the reinforced portion and the thickness h2 of the body portion satisfy: 1<(h1+h2)/h2<=2.8, so that the reinforced portion can locally thicken the body portion to improve the overall structural strength of the body portion. Meanwhile, the overall thickness of the body portion and the reinforced portion is not too thick, so that the structural strength of the explosion-proof sheet is not too strong, thus ensuring a high cracking precision of the explosion-proof sheet, that is, ensuring that the explosion-proof sheet can crack when the pressure borne by the explosion-proof sheet reaches a threshold range, and the explosion-proof sheet has a good effect of improving the safety of the battery.
- To illustrate the technical solutions in the embodiments of the present disclosure more clearly, the drawings required in the embodiments will be briefly described below. It is apparent that the drawings in the following description are merely some of the embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.
-
FIG. 1 is a schematic structural view of a top cover assembly according to a first aspect of the present disclosure; -
FIG. 2 is a schematic structural exploded view of a top cover assembly according to a first aspect of the present disclosure; -
FIG. 3 is a partial cross-sectional view of a top cover assembly according to the first aspect of the present disclosure; -
FIG. 4 is another partial cross-sectional view of the top cover assembly according to the first aspect of the present disclosure; -
FIG. 5 is a schematic structural view of an explosion-proof sheet according to the first aspect of the present disclosure; -
FIG. 6 is a cross-sectional view taken along line A-A inFIG. 5 ; -
FIG. 7 is a cross-sectional view taken along line B-B inFIG. 5 ; -
FIG. 8 is another three schematic structural views of an explosion-proof sheet according to the first aspect of the present disclosure; -
FIG. 9 is a partial cross-sectional view of an explosion-proof sheet according to the first aspect of the present disclosure; -
FIG. 10 is a schematic structural view of a battery according to a second aspect of the present disclosure; and -
FIG. 11 is a schematic structural exploded view of a battery according to the second aspect of the present disclosure. - 1, top cap assembly; 10, top cover plate; 100, explosion-proof hole; 100 a, first step surface; 100 b, second step surface; 11, explosion-proof sheet; 110, connecting portion; 111, body portion; 111 a, first surface; 111 b, second surface; 112, weak portion; 112 a, first portion; 112 b, second portion; 113, reinforced portion; 113 a, end portion; 113 b, first reinforced portion; 113 c, second reinforced portion; 113 d, third reinforced portion; 113 e, middle connecting portion; uhf, opening; 113 g, top portion; 12, explosion-proof valve patch; 140, straight line segment; 141, arc-shaped segment; 2, battery; 20, housing; 200, accommodating cavity; 201, opening; 21, battery cell.
- The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. It is apparent that the described embodiments are merely a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.
- In the present disclosure, the terms “upper”, “lower”, “left”, “right”, “front”, “rear”, “top”, “bottom”, “inner”, “outer”, “middle”, “vertical”, “horizontal”, “transverse”, “longitudinal”, etc. indicate the orientation or position relationship based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the present disclosure and the embodiments thereof, and are not intended to limit the fact that the indicated device, element, or component must have a particular orientation, or be constructed and operated in a particular orientation.
- In addition, some of the above terms may be used to express other meanings besides orientation or positional relationship, for example, the term “on” may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present disclosure can be understood on a case-by-case basis.
- In addition, the terms “installed”, “arranged”, “provided”, “connected”, “joined” should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or may be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure may be understood on a case-by-case basis.
- In addition, the terms “first”, “second”, etc. are mainly used to distinguish different devices, elements or components (which may or may not be of the same specific types and configurations), and are not used to indicate or imply the relative importance and number of the indicated devices, elements, or components. Unless otherwise stated, “a plurality of” means two or more.
- The inventor found that during the use of the battery, the internal heat of the battery could not be dissipated in time to result in the expansion of the internal hot air, so that a pressure difference is formed inside and outside the battery, and under the action of the pressure difference, the battery is prone to explosion, resulting in a safety accident. Therefore, in the related art, in order to ensure the use safety of the battery, an explosion-proof hole is generally formed in the top cover plate of the battery, and an explosion-proof sheet is arranged at the explosion-proof hole. When the pressure inside the battery reaches a threshold value, the explosion-proof sheet can automatically generate damage under excessive pressure when the pressure inside the battery reaches a threshold value, so that the inside and the outside of the battery are communicated through the explosion-proof hole and the crack of the explosion-proof sheet, so that high-temperature and high-pressure gas inside the battery is released, the internal and external pressure difference of the battery is balanced, so as to avoid the battery explosion and ensure the use safety of the battery.
- However, in the actual use process, there is often a problem that the cracking accuracy of the explosion-proof sheet is not high, resulting in premature cracking of the explosion-proof sheet when the air pressure inside the battery has not yet reached the threshold value, or cracking only when the air pressure inside the battery far exceeds the threshold value, resulting in poor safety of the use of the battery. In the daily use process, the air pressure inside the battery changes along with the temperature of the environment where the battery is located, so that the explosion-proof sheet continuously deforms under the action of different pressures, so that the structure of the explosion-proof sheet is prone to aging and fragile due to multiple times of deformation. As a result, before the air pressure inside the battery reaches the threshold value, the explosion-proof sheet cannot withstand the pressure and break, thus affecting the normal service life of the battery.
- Based on this, the present disclosure discloses a top cover assembly, the top cover assembly comprising: a top cover plate and an explosion-proof sheet. An explosion-proof hole is formed in the top cover plate, the explosion-proof sheet is configured for being connected to the top cover plate to close the explosion-proof hole. The explosion-proof sheet comprises a connecting portion, a body portion, a weak portion and a reinforced portion. The connecting portion is configured for being connected to the top cover plate, the body portion is connected with the connecting portion and configured for closing the explosion-proof hole, the weak portion is located between the body portion and the connecting portion, and the reinforced portion is convexly arranged on the body portion. When the pressure inside the battery reaches a threshold, the weak portion breaks, so that the body portion is at least partially separated from the connecting portion, so that a gap is generated between the body portion and the connecting portion, so that the high-temperature high-pressure gas inside the battery discharges to the outside of the battery.
- By arranging the reinforced portion at the body portion, the deformation of the explosion-proof sheet under different pressure can be mitigated, that is, the deformation of the weak portion caused by the floating of the normal air pressure inside the battery during normal use of the battery can be reduced, and the aging probability of the weak portion is reduced, thereby avoiding the premature cracking of the weak portion when the internal pressure of the battery does not reach the threshold value, thereby improving the service life of the battery while ensuring the use safety of the battery. In addition, the thickness h1 of the reinforced portion and the thickness h2 of the body portion satisfy: 1<(h1+h2)/h2≤2.8, which enables the body portion to be deformed when the pressure borne by the body portion reaches the threshold to make the weak portion crack, the structure of the explosion-proof sheet is reasonable, the cracking accuracy is high, and the explosion-proof sheet is effective in improving the safety of the battery, where the cracking accuracy refers to the degree of proximity of the actual pressure to the pressure threshold when the cracking of the explosion-proof sheet occurs.
- The technical solutions of the present disclosure will be further described below with reference to the embodiments and accompanying drawings.
- Referring to
FIG. 1 toFIG. 3 ,FIG. 1 is a schematic structural view of a top cover assembly according to a first aspect of the present disclosure,FIG. 2 is a schematic structural exploded view of a top cover assembly according to a first aspect of the present disclosure,FIG. 3 is a partial cross-sectional view of a top cover assembly according to the first aspect of the present disclosure. The first aspect of the embodiments of the present disclosure discloses atop cover assembly 1 that can be applied to a battery, which can include a housing and an battery cell provided in the housing, and thetop cover assembly 1 is connected to the housing to cover the opening of the housing. Thetop cover assembly 1 includes atop cover plate 10 and an explosion-proof sheet 11. Thetop cover plate 10 is provided with an explosion-proof hole 100 penetrating through thetop cover plate 10 along its own thickness direction. The explosion-proof sheet 11 is configured for being connected to thetop cover plate 10 to close the explosion-proof hole 100. The explosion-proof plate 11 comprises a connectingportion 110, abody portion 111 and aweak portion 112. The connectingportion 110 is configured for being connected to thetop cover plate 10. Thebody portion 111 is connected to the connectingportion 110 and is configured for being disposed in the explosion-proof hole 100 to close the explosion-proof hole 100. Thebody portion 111 is provided with a reinforcedportion 113. Theweak portion 112 is located between thebody portion 111 and the connectingportion 110. Along the thickness direction of the explosion-proof sheet 11, the thickness of the reinforcedportion 113 is h1, the thickness of thebody portion 111 is h2, and 1<(h1+h2)/h2≤2.8. - In the
top cover assembly 1 of the present embodiment, the explosion-proof sheet 11 includes aweak portion 112 connected between the connectingportion 110 and thebody portion 111, such that when the pressure borne by the explosion-proof sheet 11 is too large (i.e., when the air pressure in the housing exceeds a threshold value), theweak portion 112 can generate cracking, so that the process of cracking the explosion-proof sheet 11 is controllable while the high-temperature high-pressure gas in the housing of the battery is timely discharged, thereby reducing the intensity of the cracking process of the explosion-proof sheet 11, and reducing the impact of the explosion-proof sheet 11 during breakage. Meanwhile, by arranging the reinforcedportion 113 on thebody portion 111, the structural strength of thebody portion 111 can be improved, so that the overall deformation of thebody portion 111 and the reinforcedportion 113 is reduced when the explosion-proof sheet 11 is subjected to external force, thereby effectively relieving the deformation effect of the explosion-proof sheet 11 under different pressure effects, and reducing the aging probability of the explosion-proof sheet 11, thereby preventing theweak portion 112 from premature cracking when the pressure borne by theweak portion 112 does not reach the threshold value, thereby prolonging the service life of the battery. - For example, the thickness h1 of the reinforced
portion 113 and the thickness h2 of thebody portion 111 satisfy: 1<(h1+h2)/h2≤2.8, for example, (h1+h2)/h2 is 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 or 2.8. In this way, the reinforcedportion 113 can locally thicken thebody portion 111 to improve the overall structural strength of thebody portion 111. - For ease of description, the side of the
top cover assembly 1 for facing the inside of the battery (i.e., the side facing the inside of the housing of the battery) is defined as the inner side, and the side of thetop cover assembly 1 for facing the outside of the battery (i.e., the side away from the inside of the housing) is defined as the outer side, as shown inFIG. 3 , with the arrows inFIG. 3 illustrating the inner side direction as well as the outer side direction. - In some embodiments, the
top cover assembly 1 further comprises an explosion-proof valve patch 12, the explosion-proof valve patch 12 is configured for being connected to thetop cover plate 10 and covering the explosion-proof hole 100, along the thickness direction of the explosion-proof sheet 11, the explosion-proof valve patch 12 is located on the upper side of the explosion-proof sheet 11 and is spaced apart from the explosion-proof sheet 11. By arranging the explosion-proof valve patch 12 and the explosion-proof sheet 11 at intervals, a deformation space can be provided for the explosion-proof sheet 11, so that the explosion-proof sheet 11 is deformed to crack at theweak portion 112. - It should be noted that, since the thickness h1 of the reinforced
portion 113 and the thickness h2 of thebody portion 111 satisfy: 1<(h1+h2)/h2≤2.8, the overall thickness of thebody portion 111 and the reinforcedportion 113 is not too thick, so that sufficient space exists between the explosion-proof sheet 11 and the explosion-proof valve patch 12, so that the overall thickness of thetop cover assembly 1 can be made smaller while the explosion-proof sheet 11 is deformed, so as to achieve the thin design of thetop cover assembly 1. - It will be appreciated that the explosion-
proof valve patch 12 described in the foregoing is located on the upper side of the explosion-proof sheet 11, which means that the explosion-proof valve patch 12 is located on a side of the explosion-proof sheet 11 facing the outside of the battery, so that the explosion-proof valve patch 12 can protect the explosion-proof sheet 11 from one side of the explosion-proof sheet 11 facing the outside of the battery, thereby avoiding the explosion of the explosion-proof sheet 11 due to accidental impact on the surface of the battery during the use of the battery, which would otherwise affect the use safety of the battery. - Referring to
FIG. 3 andFIG. 4 , in some embodiments, the explosion-proof hole 100 may be a step hole, the hole wall of the explosion-proof hole 100 may form afirst step surface 100 a, and the connectingportion 110 of the explosion-proof sheet 11 is connected to thefirst step surface 100 a, so that the connecting position of the explosion-proof plate 11 relative to the explosion-proof hole 100 can be limited and guided by thefirst step surface 100 a, so that the explosion-proof sheet 11 can be easily connected to a specific position of the explosion-proof hole 100 (i.e., thefirst step surface 100 a). - Further, the hole wall of the explosion-
proof hole 100 may further form asecond step surface 100 b spaced apart from thefirst step surface 100 a, thesecond step surface 100 b is located on the upper side of thefirst step surface 100 a, and the explosion-proof valve patch 12 is connected to thesecond step surface 100 b. The connecting position of the explosion-proof valve patch 12 relative to the explosion-proof hole 100 can be limited and guided through thesecond step surface 100 b, so that the mounting process of the explosion-proof valve patch 12 is simpler and more convenient. At the same time, the relative position of the explosion-proof sheet 11 relative to the explosion-proof valve patch 12 can be limited by thefirst step surface 100 a and thesecond step surface 100 b, so that the explosion-proof sheet 11 is spaced from the explosion-proof valve patch 12. In this way, sufficient space is formed between the explosion-proof sheet 11 and the explosion-proof valve patch 12 for deformation of the explosion-proof sheet 11. - Referring to
FIG. 2 ,FIG. 3 andFIG. 5 ,FIG. 5 is a schematic structural view of an explosion-proof sheet 11 according to a first aspect of the present disclosure, and in some embodiments, the connectingportion 110 may be formed as an annular sheet structure, and the connectingportion 110 may be annularly disposed on the periphery of thebody portion 111. For example, the connectingportion 110 may be fixedly connected to thefirst step surface 100 a and the side wall of the explosion-proof hole 100 in a welding manner, so that the connection between theconnection part 110 and the explosion-proof hole 100 has high strength and good sealing performance. - As described above, when the interior of the battery is overheated, the
weak portion 112 of the explosion-proof sheet 11 can generate cracking to discharge the high-temperature high-pressure gas inside the battery. It will be appreciated that, when the explosion-proof sheet 11 is subjected to a large external force, theweak portion 112 may first be destroyed, thereby ensuring that the cracking position of the explosion-proof sheet 11 is theweak portion 112, so that the cracking process of the explosion-proof sheet 11 is controllable, and the use safety of the explosion-proof sheet 11 is high. Therefore, the structural strength of theweak portion 112 should be less than the structural strength of thebody portion 111 and the connectingportion 110. On this basis, in the inner and outer directions, the thickness of theweak portion 112 may be smaller than the thickness of thebody portion 111 and the connectingportion 110, so that the structural strength of theweak portion 112 is less than the structural strength of thebody portion 111 and the connectingportion 110, so that when the explosion-proof sheet 11 is subjected to a large external force, theweak portion 112 can first be damaged to generate a crack. - Referring to
FIGS. 5-7 , in some embodiments, the weak portion 112 may include a first portion 112 a and a second portion 112 b connected to each other, along a thickness direction of the explosion-proof sheet 11 (i.e., in the inner and outer directions), a minimum thickness of the first portion 112 a is h3, a minimum thickness of the second portion 112 b is h4, a thickness h2 of the body portion 111, a minimum thickness h3 of the first portion 112 a, and a minimum thickness h4 of the second portion 112 b may satisfy: h2>h3>h4 such that the structural strength of the second portion 112 b is less than the structural strength of the first portion 112 a, and the structural strength of the first portion 112 a is less than the structural strength of the body portion 111, so that the second portion 112 b is more likely to crack immediately when the pressure is greater than the threshold value, so as to further improve the cracking accuracy of the explosion-proof sheet 11, and while the second portion 112 b is cracked, the body portion 111 can still be connected to the connecting portion 110 through the first portion 112 a, that is, the body portion 111 may not be separated from the explosion-proof hole 100, so as to avoid the situation that the body portion 111 is completely separated from the connecting portion 110. In order to distinguish thebody portion 111, theweak portion 112, and the connectingportion 110,FIG. 6 andFIG. 7 show the connections of theweak portion 112 with thebody portion 111 and the connectingportion 110 respectively by dotted lines. It will be understood that the dotted lines are intended only as an indication of the position of the connections and do not constitute a limitation on the physical structure. - Further, since the thickness h3 of the
first portion 112 a is less than the thickness h1 of thebody portion 111, that is, the structural strength of thefirst portion 112 a is less than the structural strength of thebody portion 111, thesecond portion 112 b can be cracked when the pressure inside the battery exceeds the threshold. At the same time, the pressure inside the battery rises rapidly, causing the pressure on the explosion-proof sheet 11 to exceed the threshold instantaneously, thefirst portion 112 a can act as a secondary cracking mechanism, that is, thefirst portion 112 a can also be cracked to make the connection area between thebody portion 111 and the connectingportion 110 smaller, or to make thebody portion 111 separate from the connectingportion 110 as a whole. Therefore, the crack area for gas leakage is larger, and the gas leakage efficiency is higher, so that the inside and outside of the battery can reach a safe state of air pressure balance more quickly. - In some embodiments, there may be one or more
second portions 112 b and one or morefirst portions 112 a. It will be appreciated that, as long as the number of thesecond portions 112 b and thefirst portions 112 a can satisfy the venting function and the safety requirement of the explosion-proof sheet 11, the number of thesecond portions 112 b and thefirst portions 112 a is not specifically limited in the present embodiment. - Exemplarily, the
second portion 112 b, there may be a plurality offirst portions 112 a andsecond portions 112 b, the plurality ofsecond portions 112 b are spaced apart, the plurality offirst portions 112 a are respectively connected between the plurality ofsecond portions 112 b, the thickness of each of thefirst portions 112 a may be equal, and the structural strength of each offirst portions 112 a may be equal, so that the overall force borne by the explosion-proof sheet 11 is more uniform, or the thickness of at least onefirst portion 112 a is less than the thickness of the otherfirst portions 112 a, so that the structural strength of the at least onefirst portion 112 a is less than the structural strength of the otherfirst portions 112 a, so that when the pressure inside the battery rises rapidly and the pressure borne by the explosion-proof sheet 11 is instantaneously far above a threshold, thefirst portions 112 a can also follow thesecond portions 112 b to start to crack from afirst portion 112 a with the least strength, thereby increasing the area of cracking, thereby quickly balancing the internal and external pressure difference of the housing of the battery. - Referring to
FIG. 5 toFIG. 7 , it will be appreciated that when thesecond portion 112 b of the explosion-proof sheet 11 is cracked (i.e., a crack is generated between thebody portion 111 and the connecting portion 110), the connectingportion 110 is still fixedly connected to thefirst step surface 100 a of the explosion-proof hole 100, and thebody portion 111 is displaced relative to the connectingportion 110, so that thebody portion 111 is at least partially separated from the connectingportion 110 to generate a crack. Based on this, theweak portion 112 may be a racetrack-shaped structure, the racetrack-shaped structure may include two straight-line segments 140 and two arc-shapedsegments 141, the two straight-line segments 140 are parallel to each other, and the two arc-shapedsegments 141 are connected to both ends of the two straight-line segments 140 respectively, so that the two straight-line segments 140 have no shape change along the extension direction, and it is difficult to generate stress concentration, while the shape of the arc-shapedsegments 141 along the extension direction changes gently, and the stress concentration can be greatly mitigated. - Further, the straight line segments 140 may be formed as the
first portion 112 a, and the arc-shapedsegments 141 may be formed as thesecond portion 112 b, so that when the explosion-proof sheet 1 is subjected to pressure, it is difficult to generate stress concentration at thefirst portion 112 a, and the stress concentration at thesecond portion 112 b can be greatly mitigated, which can reduce the situation that thesecond portion 112 b is cracked prematurely due to excessive local stress caused by stress concentration before the pressure borne by the explosion-proof sheet 11 reaches the threshold value, which would otherwise affects the safety of the battery. - As can be seen from the foregoing, the reinforced
portion 113 is configured to enhance the strength of thebody portion 111 to reduce the overall deformation generated by the reinforcedportion 113 and thebody portion 111 when the explosion-proof sheet 11 is subjected to pressure, thereby reducing the deformation generated by the explosion-proof sheet 11 at the position of thebody portion 111. - Further, the
body portion 111 may include afirst surface 111 a and asecond surface 111 b opposite to each other along the thickness direction of thebody portion 111 itself (i.e., along the inner and outer directions), and thefirst surface 111 a and/or thesecond surface 111 b are provided with the reinforcedportion 113, that is, the reinforcedportion 113 may be provided on thefirst surface 111 a, or may be provided on thesecond surface 111 b, or both thefirst surface 111 a and thesecond surface 111 b may be provided with the reinforcedportion 113. It will be appreciated that as long as thebody portion 111 can make the overall structural strength of thebody portion 111 and the reinforcedportion 113 meet the requirements of use, the present embodiment does not specifically limit the position of the reinforcedportion 113 on thebody portion 111. - Next, in this embodiment, the reinforced
portion 113 is provided on thefirst surface 111 a as an example for description. - Referring again to
FIG. 3 , exemplarily, the overall thickness (i.e., h1+h2) of the reinforcedportion 113 and thebody portion 111 may satisfy: 0.3 mm≤(h1+h2)≤1.7 mm, for example, the overall thickness (h1+h2) of the reinforcedportion 113 and thebody portion 111 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, or 1.7 mm, etc., so that the overall structural strength of the reinforcedportion 113 and thebody portion 111 can satisfy that the overall deformation of the reinforcedportion 113 and thebody portion 111 is relatively small when the pressure borne by the explosion-proof sheet 11 does not exceed the threshold. - It will be appreciated that the structural strength of the reinforced
portion 113 and thebody portion 111 varies depending on the material of the explosion-proof sheet 11 when the overall thickness of the reinforcedportion 113 and thebody portion 111 remains the same. In order for the structural strength of the reinforcedportion 113 and thebody portion 111 to meet the requirements of use, and for the explosion-proof sheet 11 to be able to crack timely and quickly if the pressure to which it is subjected exceeds a threshold value, the explosion-proof sheet 11 as a whole may be made of metal, for example, the explosion-proof sheet 11 may be a thin sheet of aluminum. - Further, along the thickness direction (i.e., the inner and outer directions) of the explosion-
proof sheet 11, the projection area of thebody portion 111 is S1, and the projection area of the reinforcedportion 113 is S2. In order to enable the reinforcedportion 113 to achieve the function of improving the overall structural strength of thebody portion 111, at the same time, in order to enable thebody portion 111 to be greatly deformed when the pressure on the explosion-proof sheet 11 is greater than the threshold value so that theweak portion 112 can be successfully cracked, the overall structural strength of thebody portion 111 should not be too large, so that the projection area S1 of the reinforcedportion 113 on thebody portion 111 should not be too large. Based on this, the area S1 and the area S2 may satisfy: 5≤S1/S2≤10, for example, S1/S2 may be 5.0, 5.3, 5.5, 5.7, 6.0, 6.3, 6.5, 6.7, 7.0, 7.3, 7.5, 7.7, 8.0, 8.3, 8.5, 8.7, 9.0, 9.3, 9.5, 9.7, or 10.0, etc. - It should be noted that “the projection of the
body portion 111 along the inner and outer directions” refers to the projection of thebody portion 111 along the inner and outer directions on a plane perpendicular to the inner and outer directions, and “the projection of the reinforcedportion 113 along the inner and outer directions” refers to the projection of the reinforcedportion 113 along the inner and outer directions on a plane perpendicular to the inner and outer directions. - Referring to
FIG. 5 andFIG. 8 , in some embodiments, the reinforcedportion 113 may be a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories. Exemplarily, as shown in (A) ofFIG. 8 , the reinforcedportion 113 may extend along multiple arc-shaped segments to form a wavy convex ridge. As shown inFIGS. 5 and (B) ofFIG. 8 , and the reinforcedportion 113 may be an arc-shaped convex ridge. - In some embodiments, since the deformation of the middle portion of the
body portion 111 is greatest when the explosion-proof sheet 11 is subjected to pressure, in order to make the overall deformation resistance of thebody portion 111 better, the structural strength needs to be improved for the middle portion of thebody portion 111. Based on this, the reinforcedportion 113 can extend from the middle portion of thebody portion 111 to the two sides of thebody portion 111, so that the reinforcedportion 113 can effectively improve the structural strength of the middle region of thebody portion 111. At the same time, since the reinforcedportion 113 extends from the middle portion of thebody portion 111 to both sides of thebody portion 111, the reinforcedportion 113 can be used to disperse the force on the middle portion of thebody portion 111 to both sides of thebody portion 111, so that the overall force on thebody portion 111 is even, and the deformation resistance of thebody portion 111 is better. - In some embodiments, along the extending direction of the reinforced
portion 113, the reinforcedportion 113 has twoend portions 113 a, and the twoend portions 113 a may extend toward theweak portion 112, in other words, theend portions 113 a of the reinforcedportion 113 may extend to be close to theweak portion 112, or may extend to be connected to theweak portion 112, so that the structure of the portion of thebody portion 111 adjacent to theweak portion 112 is also reinforced, so as to reduce the deformation of the portion adjacent to theweak portion 112 when thebody portion 111 is subjected to external force, thereby reducing the deformation generated by theweak portion 112 to a greater extent during normal use of the battery, and further improving the anti-aging effect of theweak portion 112. - At the same time, when the internal air pressure of the battery reaches a threshold value, the
body portion 111 deforms in a plurality of different directions, and since the reinforcedportion 113 of the arc-shaped segment or the wavy segment may extend in a plurality of different directions, the deformation of thebody portion 111 may be adapted in a plurality of different directions, thereby improving the impact resistance of thebody portion 111. - Exemplarily, at least one
end portion 113 a of the reinforcedportion 113 may extend to be connected to theweak portion 112, so that when the explosion-proof sheet 11 is subjected to an external force, the deformation generated by theweak portion 112 near the periphery of theend portion 113 a is minimal, and the anti-aging effect achieved by the reinforcedportion 113 on theweak portion 112 at the position is best. - As described above, the
weak portion 112 may include afirst portion 112 a and asecond portion 112 b connected to each other, and theweak portion 112 may be a racetrack-shaped structure, the racetrack-shaped structure may include two straight line segments 140 and two arc-shapedsegments 141, the two straight line segments 140 are formed as twofirst portions 112 a. Optionally, at least oneend portion 113 a of the reinforcedportion 113 may extend to be connected to the connection between thefirst portion 112 a and thesecond portion 112 b, or, at least oneend portion 113 a of the reinforcedportion 113 may extend to be connected to thefirst portion 112 a, so that the reinforcing effect of the reinforcedportion 113 on the structural strength of thebody portion 111 can extend to the connection between thebody portion 111 and thefirst portion 112 a, so as to further increase the structural strength gap between thefirst portion 112 a and thesecond portion 112 b, so that thesecond portion 112 b is easier to quickly and timely generate cracking when the pressure borne by the explosion-proof sheet 11 exceeds a threshold value. As shown inFIG. 5 , the twoend portions 113 a of the reinforcedportion 113 respectively extend to the two connections of thefirst portion 112 a and thesecond portion 112 b and are connected to thefirst portion 112 b. - Referring to
FIG. 5 andFIG. 8 , there may be one or more reinforcedportions 113, as long as the reinforcedportions 113 can be used to reinforce the overall structural strength of thebody portion 111, so that the overall structural strength of thebody portion 111 meets the design and use requirements, and the number of the reinforcedportions 113 is not specifically limited in the present embodiment. Exemplarily, there may be a plurality of reinforcedportions 113, so that the structural strength enhancement effect of the reinforcedportions 113 on thebody portion 111 can be improved by increasing the number of the reinforcedportions 113. - As previously described, the reinforced
portion 113 may be a convex ridge extending along an arc-shaped, wavy, zigzag, or straight line trajectories, and when there is a plurality of the reinforced portions, it will be appreciated that the shape of each reinforcedportion 113 may be the same (as shown inFIG. 5 and in (B) ofFIG. 8 , as shown inFIG. 5 and in (B) ofFIG. 8 , where there are two reinforcedportions 113, both of which are convex ridges extending along an arc-shaped trajectory), or each reinforcedportion 113 may have a different shape, alternatively, some of the plurality of reinforcedportions 113 may have the same shape and another part of the reinforcedportions 113 may have different shapes (as shown in (C) ofFIG. 5 , which illustrates three reinforcedportions 113, two of which are convex ridges extending along an arc-shaped trajectory and the remaining one of which is a convex ridge along a straight line trajectory), as long as the reinforcedportions 113 can make the overall structural strength of thebody portion 111 and the reinforcedportions 113 meet the use requirements, and the extension shape of each reinforcedportion 113 is not specifically limited in this embodiment. - Optionally, when there are a plurality of reinforced
portions 113, at least two reinforcedportions 113 are symmetrically arranged relative to the center of thebody portion 111, so that the structural strength reinforcing effect of the reinforcedportions 113 on thebody portion 111 is more balanced, so that the force on thebody portion 111 is more even, and the use stability of thebody portion 111 is high. - Further, at least two adjacent reinforced
portions 113 may be connected, and/or at least two adjacent reinforcedportions 113 may be arranged at intervals, in other words, in the plurality of reinforcedportions 113, two adjacent reinforcedportions 113 are connected to each other, or the plurality of reinforcedportions 113 are spaced apart from each other, or there are two adjacent reinforcedportions 113 that are connected while two adjacent reinforcedportions 113 are provided at intervals. As shown inFIG. 5 , in an optional example, the reinforcedportion 113 is two, and the two reinforcedportions 113 are connected to each other. As shown in (B) ofFIG. 8 , in another optional example, there are two reinforcedportions 113, and the two reinforcedportions 113 are spaced apart. As shown in (C) ofFIG. 8 , in an optional example, there are three reinforcedportions 113, and the three reinforcedportions 113 are defined as the first reinforcedportion 113 b, the second reinforcedportion 113 c and the third reinforcedportion 113 d, the first reinforcedportion 113 b is connected to the second reinforcedportion 113 c and the third reinforcedportion 113 d, respectively, and the second reinforcedportion 113 c is spaced apart from the third reinforcedportion 113 d. - It will be appreciated that, when at least two adjacent reinforced
portions 113 are connected, the two adjacent reinforcedportions 113 can mutually reinforce the structural strength, thereby further improving the structural strength reinforcing effect of the reinforcedportion 113 on thebody portion 111. - Optionally, at least two reinforced
portions 113 are connected in the middle of the reinforcedportions 113 themselves to form amiddle connecting portion 113 e, and themiddle connecting portion 113 e is located in the middle of thebody portion 111, so that the force borne by the middle portion of thebody portion 111 can be dispersed to the multiple sides of thebody portion 111 through the reinforcedportion 113, so that the force on thebody portion 111 is more even, and the use stability of thebody portion 111 is further improved. As shown inFIG. 5 , exemplarily, there are two reinforcedportions 113, and the two reinforcedportions 113 are convex ridges extending along the arc-shaped trajectories, for example, taking a C-shaped ridge as an example, theopenings 113 f of two C-shaped ridges are arranged opposite to each other, and are symmetrically arranged relative to the center of thebody portion 111, and the two C-shaped ridges can be connected at the middle of thebody portion 111 to form amiddle connecting portion 113 e. Themiddle connecting portion 113 e at least partially covers the middle position of thebody portion 111, so that themiddle connecting portion 113 e can effectively reinforce the middle position of thebody portion 111, thereby effectively improving the deformation resistance of thebody portion 111 in the middle position. - Optionally, along the thickness direction of the explosion-
proof sheet 11, the projection area of thebody portion 111 is S1, the projection area of themiddle connecting portion 113 e is S3, and the area of themiddle connecting portion 113 e should meet the requirement for structural strength reinforcement required for the middle position of thebody portion 111, but also meet the requirement that thebody portion 111 can generate large deformation when the pressure borne by thebody portion 111 exceeds a threshold value, so that theweak portion 112 can deform and crack. Based on this, the area S2 and the area S3 may satisfy: 80≤S2/S3≤600, for example, the area ratio S2/S3 may be 80, 90, 100, 110, 130, 150, 170, 200, 230, 250, 270, 300, 330, 350, 370, 400, 430, 450, 470, 500, 530, 550, 570, or 600, etc. - It should be noted that “the projection of the
body portion 111 along the inner and outer directions” refers to the projection of thebody portion 111 along the inner and outer directions on a plane perpendicular to the inner and outer directions, and “the projection of themiddle connecting portion 113 e along the inner and outer directions” refers to the projection of themiddle connecting portion 113 e along the inner and outer directions on a plane perpendicular to the inner and outer directions. - It should also be noted that the “middle portion of the
body portion 111” in the foregoing refers to a central point in the shape of thebody portion 111 and a region near the center point. For example, the middle portion of thebody portion 111 may refer to a region formed by extending from the center point of thebody portion 111 to the edge of thebody portion 111, and the projection shape of the region on the plane perpendicular to the inner and outer directions is the same as the projection shape of thebody portion 111 on the plane perpendicular to the inner and outer directions, and the projection area of the region on thetop cover plate 10 is S4, and S1/S4=4. - The inventors have found through research that the shape of the cross-section of the reinforced
portion 113 cut by the plane perpendicular to the extending track of the reinforcedportion 113 has an important influence on the structural strength of the reinforcedportion 113 and the deformation resistance of thebody portion 111 when the force to which it is subjected does not exceed a threshold value. Based on this, the present embodiment further defines a cross section of the reinforcedportion 113, so that the deformation resistance of thebody portion 111 meets the requirements. - Referring to
FIG. 9 ,FIG. 9 is a partial cross-sectional view of the explosion-proof sheet 11 according to the first aspect of the present disclosure. In some embodiments, at least one outer surface of the reinforcedportion 113 is an inclined surface (i.e., a cross-sectional shape of the reinforcedportion 113 is trapezoidal) or an arc surface, so that the width (i.e., the width of the cross section) of the reinforcedportion 113 gradually increases from thetop portion 113 g of the reinforcedportion 113 toward thebody portion 111. Thus, compared with the case where the width of the reinforcedportion 113 is constant or gradually decreases from thetop portion 113 g of the reinforcedportion 113 toward thebody portion 111, when the overall structural strength of the reinforcedportion 113 and thebody portion 111 is the same, the reinforcedportion 113 has the smallest volume. In other words, the width of the reinforcedportion 113 is gradually increased from thetop portion 113 g of the reinforcedportion 113 toward thebody portion 111, so that the reinforcedportion 113 can obtain greater structural strength with a smaller volume, thereby saving the material used for the reinforcedportion 113, so as to reduce the material cost of the explosion-proof sheet 11, and at the same time reduce the space occupied by the reinforcedportion 113 to increase the deformation space of the explosion-proof sheet 11, so as to make the structure of thetop cover assembly 1 more compact and reasonable. In order to facilitate the distinction between thebody portion 111 and the reinforcedportion 113, the connection between thebody portion 111 and the reinforcedportion 113 is shown by dotted lines inFIG. 9 . It will be appreciated that, the dashed-dotted line only serves as an indication of a position of the connection, and does not constitute a limitation on the physical structure. - It will be appreciated that, when the reinforced
portion 113 is provided on the side surface of thebody portion 111 facing the explosion-proof valve patch 12, in the process that thebody portion 111 is at least partially detached from the connectingportion 110, the reinforcedportion 113 may follow thebody portion 111 to move in a direction towards the outside of the battery to strike the explosion-proof valve patch 12. Since the width of thetop portion 113 g of the reinforcedportion 113 can be smaller, the top surface area of the reinforcedportion 113 can be smaller, so that when thetop portion 113 g of the reinforcedportion 113 strikes the explosion-proof valve patch 12, the contact area between the reinforcedportion 113 and the explosion-proof valve patch 12 is relatively small, and the pressure applied to the explosion-proof valve patch 12 is relatively large, so that the explosion-proof valve patch 12 is prone to being damaged or easily separated from thetop cover plate 10. Therefore, the explosion-proof valve patch 12 no longer closes the explosion-proof hole 100, and the high-temperature high-pressure gas inside the battery can be discharged to the outside of the battery through the explosion-proof hole 100. - Optionally, an outer surface of the reinforced
portion 113 is an inclined surface or an arc surface, as shown in (A) and (B) ofFIG. 9 , (A) ofFIG. 9 shows that the reinforcedportion 113 has an outer surface as an inclined surface, and (B) ofFIG. 9 shows that the reinforcedportion 113 has an outer surface as an arc surface, or two surfaces of the reinforcedportion 113 are inclined surfaces (as shown in (C) ofFIG. 9 ) or both are arc surfaces, or one surface may be an inclined surface, and the other surface is an arc surface (as shown in (D) ofFIG. 9 ). It will be appreciated that when the two surfaces of the reinforcedportion 113 are both inclined surfaces or arc surfaces, or, one surface of the reinforcedportion 113 is an inclined surface, and the other surface is an arc surface, to achieve the same structural strength, the reinforcedportion 113 uses the least amount of material, and the least amount of material is cost to produce the explosion-proof sheet 11. - Further, considering that it is only necessary to make the reinforcing effect of the reinforced
portion 113 on thebody portion 111 to meet the use requirements when the pressure borne by the explosion-proof sheet 11 is less than the threshold value, and therefore, the reinforcing effect of the reinforcedportion 113 on the structural strength of thebody portion 111 does not need to be too large, and the width d of one side of the reinforcedportion 113 connected to thebody portion 111 can satisfy: d≤0.7 mm, for example, the width d of one side of the reinforcedportion 113 connected to thebody portion 111 may be 0.7 mm, 0.65 mm, 0.6 mm, 0.55 mm, 0.5 mm, 0.45 mm, 0.4 mm, 0.35 mm, 0.3 mm, 0.25 mm, 0.2 mm, 0.15, or 0.1 mm. - Referring to
FIG. 10 andFIG. 11 ,FIG. 10 is a schematic structural view of a battery according to a second aspect of the present disclosure.FIG. 11 is a schematic structural exploded view of the battery according to the second aspect of the present disclosure. The second aspect of the embodiments of the present disclosure discloses abattery 2, including thetop cover assembly 1 described in the first aspect above. Thebattery 2 may be a secondary battery. Thebattery 2 further includes ahousing 20 and abattery cell 21. Thehousing 20 has anaccommodating cavity 200, and theaccommodating cavity 200 forms the inside of the battery described above. Thehousing 20 has anopening 201 communicating with an external space. Thetop cover assembly 1 is fixedly connected to thehousing 20 and closes theopening 201, and thebattery cell 21 is provided in theaccommodating cavity 200. - According to the
battery 2 disclosed in the second aspect of the embodiments of the present disclosure, when the internal pressure of thebattery 2 reaches or exceeds a threshold value, the gas inside thebattery 2 can break the explosion-proof sheet 1 and be released to the outside of thebattery 2, so that the internal and external air pressure of thebattery 2 is balanced, and explosion of thebattery 2 is avoided. Due to the strong anti-aging capability of the explosion-proof sheet 1, the probability of premature cracking of the explosion-proof sheet 1 in the normal use process of thebattery 2 is low, the service life of thebattery 2 is longer, and the explosion-proof sheet 1 can generate cracking more quickly and timelier when the pressure borne by the explosion-proof sheet 1 exceeds the threshold value. Therefore, when the air pressure inside thebattery 2 rises above the threshold value, thebattery 2 can perform pressure relief more quickly and timelier, so as to balance the air pressure inside and outside thebattery 2, and thebattery 2 has high safety in use. - The top cover assembly and the battery disclosed in the embodiments of the present disclosure are described in detail above. Specific examples are used herein to describe the principles and implementations of the present disclosure, and the descriptions of the above embodiments are merely used to help understand the top cover assembly and the battery of the present disclosure and the core idea thereof. Meanwhile, for a person of ordinary skill in the art, according to the idea of the present disclosure, there is a change in the specific implementation and application range. In summary, the content of the present specification should not be construed as a limitation of the present disclosure.
Claims (20)
1. A top cover assembly comprising:
a top cover plate, wherein an explosion-proof hole is formed in the top cover plate; and
an explosion-proof sheet, wherein the explosion-proof sheet is configured to be connected to the top cover plate to close the explosion-proof hole, and the explosion-proof sheet comprises:
a connecting portion, wherein the connecting portion is configured to be connected to the top cover plate;
a body portion, the body portion being connected to the connecting portion and being configured to be disposed in the explosion-proof hole to close the explosion-proof hole, the body portion being provided with at least one reinforced portion; and
a weak portion, the weak portion being located between the body portion and the connecting portion;
wherein along a thickness direction of the explosion-proof sheet, a thickness of the reinforced portion is h1, a thickness of the body portion is h2, and 1<(h1+h2)/h2≤2.8.
2. The top cover assembly according to claim 1 , wherein 0.3 mm≤(h1+h2)≤1.7 mm.
3. The top cover assembly according to claim 1 , wherein at least one outer surface of the reinforced portion is an inclined surface or an arc surface, such that the reinforced portion has a width gradually increasing from a top portion of the reinforced portion toward the body portion, a width of a side of the reinforced portion connected to the body portion is d, and d≤0.7 mm.
4. The top cover assembly according to claim 1 , wherein in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the reinforced portion is S2, and 5≤S1/S2≤10.
5. The top cover assembly according to claim 2 , wherein in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the reinforced portion is S2, and 5≤S1/S2≤10.
6. The top cover assembly according to claim 3 , wherein in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the reinforced portion is S2, and 5≤S1/S2≤10.
7. The top cover assembly according to claim 1 , wherein the reinforced portion is a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories.
8. The top cover assembly according to claim 7 , wherein:
the reinforced portion is a C-shaped convex ridge;
when the body portion is provided with a plurality of the reinforced portions, at least two reinforced portions are symmetrically arranged relative to a center of the body portion, and when at least two adjacent reinforced portions are connected, the two adjacent reinforced portions are connected at their middle to form a middle connecting portion, and the middle connecting portion is located in the middle of the body portion; and
in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the middle connecting portion is S3, and 80≤S1/S3≤600.
9. The top cover assembly according to claim 2 , wherein the reinforced portion is a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories.
10. The top cover assembly according to claim 9 , wherein:
the reinforced portion is a C-shaped convex ridge;
when the body portion is provided with a plurality of the reinforced portions, at least two reinforced portions are symmetrically arranged relative to a center of the body portion, and when at least two adjacent reinforced portions are connected, the two adjacent reinforced portions are connected at their middle to form a middle connecting portion, and the middle connecting portion is located in the middle of the body portion; and
in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the middle connecting portion is S3, and 80≤S1/S3≤600.
11. The top cover assembly according to claim 3 , wherein the reinforced portion is a convex ridge extending along one or more arc-shaped trajectories or along one or more straight line trajectories.
12. The top cover assembly according to claim 11 , wherein:
the reinforced portion is a C-shaped convex ridge;
when the body portion is provided with a plurality of the reinforced portions, at least two reinforced portions are symmetrically arranged relative to a center of the body portion, and when at least two adjacent reinforced portions are connected, the two adjacent reinforced portions are connected at their middle to form a middle connecting portion, and the middle connecting portion is located in the middle of the body portion; and
in the thickness direction of the explosion-proof sheet, a projection area of the body portion is S1, a projection area of the middle connecting portion is S3, and 80≤S1/S3≤600.
13. The top cover assembly according to claim 1 , wherein in the extending direction of the reinforced portion, the reinforced portion has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
14. The top cover assembly according to claim 13 , wherein:
the weak portion comprises a first portion and a second portion connected to each other, along the thickness direction of the explosion-proof sheet, a minimum thickness of the first portion is h3, a minimum thickness of the second portion is h4, and h2>h3>h4; and
at least one end portion of the reinforced portion extends to be connected to a connection of the first portion and the second portion, or at least one end portion of the reinforced portion extends to be connected to the first portion.
15. The top cover assembly according to claim 14 , wherein:
the weak portion is a racetrack-shaped structure, the racetrack-shaped structure comprises two straight line segments and two arc-shaped segments, the two straight line segments are parallel to each other, and the two arc-shaped segments are respectively connected to both ends of the two straight line segments; and
the straight line segments are formed as the first portion, and the arc-shaped segments are formed as the second portion.
16. The top cover assembly according to claim 2 , wherein in the extending direction of the reinforced portion, the reinforced portion has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
17. The top cover assembly according to claim 16 , wherein:
the weak portion comprises a first portion and a second portion connected to each other, along the thickness direction of the explosion-proof sheet, a minimum thickness of the first portion is h3, a minimum thickness of the second portion is h4, and h2>h3>h4; and
at least one end portion of the reinforced portion extends to be connected to a connection of the first portion and the second portion, or at least one end portion of the reinforced portion extends to be connected to the first portion.
18. The top cover assembly according to claim 3 , wherein in the extending direction of the reinforced portion, the reinforced portion has two end portions, and at least one end portion of the reinforced portion extends to be connected to the weak portion.
19. The top cover assembly according to claim 18 , wherein:
the weak portion comprises a first portion and a second portion connected to each other, along the thickness direction of the explosion-proof sheet, a minimum thickness of the first portion is h3, a minimum thickness of the second portion is h4, and h2>h3>h4; and
at least one end portion of the reinforced portion extends to be connected to a connection of the first portion and the second portion, or at least one end portion of the reinforced portion extends to be connected to the first portion.
20. A battery comprising a housing and the top cover assembly according to claim 1 , wherein the housing is provided with an accommodating cavity having an opening, and the top cover assembly is connected to the housing to cover the opening of the accommodating cavity.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202122506604.1 | 2021-10-18 | ||
CN202122506604.1U CN216120620U (en) | 2021-10-18 | 2021-10-18 | Top cover assembly and battery |
Publications (1)
Publication Number | Publication Date |
---|---|
US20230123149A1 true US20230123149A1 (en) | 2023-04-20 |
Family
ID=80693622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/956,245 Pending US20230123149A1 (en) | 2021-10-18 | 2022-09-29 | Top cover assembly and battery |
Country Status (2)
Country | Link |
---|---|
US (1) | US20230123149A1 (en) |
CN (1) | CN216120620U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117691297A (en) * | 2024-02-04 | 2024-03-12 | 蜂巢能源科技股份有限公司 | Explosion-proof valve and battery |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114628846B (en) * | 2022-05-12 | 2022-09-09 | 比亚迪股份有限公司 | Battery, battery module, battery pack and vehicle |
WO2024065457A1 (en) * | 2022-09-29 | 2024-04-04 | 宁德时代新能源科技股份有限公司 | End cover, battery cell, battery and electric device |
-
2021
- 2021-10-18 CN CN202122506604.1U patent/CN216120620U/en active Active
-
2022
- 2022-09-29 US US17/956,245 patent/US20230123149A1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117691297A (en) * | 2024-02-04 | 2024-03-12 | 蜂巢能源科技股份有限公司 | Explosion-proof valve and battery |
Also Published As
Publication number | Publication date |
---|---|
CN216120620U (en) | 2022-03-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20230123149A1 (en) | Top cover assembly and battery | |
CN112382826B (en) | A explosion-proof valve, electric core and battery module for electric core | |
EP3522250B1 (en) | Cap assembly and power battery | |
TWI725613B (en) | Explosion-proof enclosure for an energy storage device and an energy storage device | |
EP2988346B1 (en) | Cell case | |
CN107302062B (en) | Secondary battery | |
CN214797550U (en) | Battery cover plate assembly and battery | |
US20230113541A1 (en) | Explosion-proof sheet of secondary battery and secondary battery | |
JP3943063B2 (en) | Sealing plate and sealed battery | |
WO2024045456A1 (en) | Explosion-proof valve and battery | |
CN219892345U (en) | Cover plate assembly of battery cell and battery cell | |
CN218939935U (en) | Explosion-proof valve structure, power battery top cover and power battery | |
CN218005153U (en) | A electric core that is used for explosion-proof valve block of electric core and has it | |
CN216928847U (en) | Battery pack shell and battery pack assembly | |
CN116646675A (en) | Battery and battery pack | |
EP4329072A1 (en) | Battery cell capable of directionally relieving pressure and battery module | |
KR102329403B1 (en) | Explosion-proof housings and energy storage devices used in energy storage devices | |
US20230026117A1 (en) | Security apparatus, manufacturing method thereof and battery | |
CN218498295U (en) | Explosion-proof structure, battery cover plate assembly and power battery | |
CN219303887U (en) | Explosion-proof valve and top cover | |
CN220914389U (en) | Battery cell cover plate, battery cell and battery pack | |
CN111697168B (en) | Lithium battery and head | |
CN220358269U (en) | Top cap subassembly, secondary cell and battery package | |
US20220013833A1 (en) | Secondary Battery | |
CN220358270U (en) | Explosion-proof valve assembly and battery |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: XIAMEN HITHIUM NEW ENERGY TECHNOLOGY CO., LTD., CHINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:XU, WEIDONG;ZHANG, NAN;TANG, YANG;AND OTHERS;SIGNING DATES FROM 20220708 TO 20220712;REEL/FRAME:061257/0534 |
|
AS | Assignment |
Owner name: XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., CHINA Free format text: CHANGE OF NAME;ASSIGNOR:XIAMEN HITHIUM NEW ENERGY TECHNOLOGY CO., LTD.;REEL/FRAME:061709/0339 Effective date: 20220816 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |